def big_swap(current_active, inactive):
ARM_m0.comment('START BIG SWAP')
ARM_m0.MOV(7, current_active[0])
# current_active[0] is now at position 7
ARM_m0.MOV(current_active[0], inactive[0])
ARM_m0.MOV(inactive[0], current_active[1])
ARM_m0.MOV(current_active[1], inactive[1])
ARM_m0.MOV(inactive[1], 7)
inactive[0], inactive[1] = inactive[1], inactive[0]
ARM_m0.comment('END BIG SWAP')
return current_active, inactive
def load_cst(rt, rnd):
ARM_m0.LDI(rt, 0x9e)
ARM_m0.LSL(rt, 8)
ARM_m0.ADD(rt, 0x37)
ARM_m0.LSL(rt, 8)
ARM_m0.ADD(rt, 0x79)
ARM_m0.LSL(rt, 8)
ARM_m0.ADD(rt, rnd)
def big_swap_permute(current_active, inactive):
ARM_m0.comment('START SWAP ACTIVE BLOCK')
ARM_m0.MOV(7, current_active[2])
ARM_m0.MOV(current_active[2], inactive[2])
ARM_m0.MOV(inactive[2], current_active[3])
ARM_m0.MOV(current_active[3], inactive[3])
ARM_m0.MOV(inactive[3], current_active[4])
ARM_m0.MOV(current_active[4], inactive[4])
ARM_m0.MOV(inactive[4], current_active[5])
ARM_m0.MOV(current_active[5], inactive[5])
ARM_m0.MOV(inactive[5], 7)
previous_active = list(current_active)
previous_inactive = list(inactive)
inactive[0] = previous_active[0]
inactive[1] = previous_active[1]
inactive[2] = previous_active[2]
inactive[3] = previous_active[3]
inactive[4] = previous_active[4]
inactive[5] = previous_active[5]
current_active[0] = previous_inactive[0]
current_active[1] = previous_inactive[1]
current_active[2] = previous_inactive[5]
current_active[3] = previous_inactive[2]
current_active[4] = previous_inactive[3]
current_active[5] = previous_inactive[4]
ARM_m0.comment('END SWAP ACTIVE BLOCK')
return current_active, inactive
def spbox(reg, idx, t0, t1):
x = reg[idx]
y = reg[idx + 2]
z = reg[idx + 4]
ARM_m0.comment('START SPBOX')
ARM_m0.comment('rotate x <<< ' + str(R))
ARM_m0.LDI(t0, ror_r)
ARM_m0.ROR(x, t0)
ARM_m0.comment('rotate y <<< ' + str(S))
ARM_m0.LDI(t0, ror_s)
ARM_m0.ROR(y, t0)
ARM_m0.comment('compute x')
ARM_m0.MOV(t1, x)
ARM_m0.MOV(t0, z)
ARM_m0.LSL(t0, 1)
ARM_m0.MOV(x, y)
ARM_m0.AND(x, z)
ARM_m0.LSL(x, 2)
ARM_m0.EOR(x, t0)
ARM_m0.EOR(x, t1)
ARM_m0.comment('compute y')
ARM_m0.MOV(t0, y)
ARM_m0.MOV(y, t1)
ARM_m0.OR(y, z)
ARM_m0.LSL(y, 1)
ARM_m0.EOR(y, t1)
ARM_m0.EOR(y, t0)
ARM_m0.comment('compute z')
ARM_m0.AND(t1, t0)
ARM_m0.LSL(t1, 3)
ARM_m0.EOR(t0, t1)
ARM_m0.EOR(z, t0)
reg[idx], reg[idx + 4] = reg[idx + 4], reg[idx]
return reg
def small_swap(reg):
ARM_m0.comment('SMALL SWAP')
reg[0], reg[1] = reg[1], reg[0]
return reg
ARM_m0.ADD(rt, 0x37)
ARM_m0.LSL(rt, 8)
ARM_m0.ADD(rt, 0x79)
ARM_m0.LSL(rt, 8)
ARM_m0.ADD(rt, rnd)
print('.syntax unified')
print('.cpu cortex-m0')
print('.align 2')
print(' .global gimli')
print(' .type gimli, %function')
print('.text')
print('gimli:')
ARM_m0.comment('*********************************************************')
ARM_m0.comment(' Inputs:')
ARM_m0.comment(' x in register r0')
ARM_m0.comment('')
ARM_m0.push_to_stack()
ARM_m0.comment('START CYCLE COUNT')
ARM_m0.LDMR(0, 1, 6)
ARM_m0.MOV(8, 1)
ARM_m0.MOV(9, 2)
ARM_m0.MOV(10, 3)
ARM_m0.MOV(11, 4)
ARM_m0.MOV(12, 5)
ARM_m0.MOV(14, 6)
ARM_m0.LDMR(0, 1, 6)